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I assume it's the 6-cylinder model.. try cleaning the throttle body and idle control valve.

Remove from car and degrease, then give them a good soaking in carb cleaner.

Let it soak in and keep repeating until everything looks clean inside.

Also check air filter and fuel pump / rail pressure if possible.
 

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have a look at the 2 3/8 outer dia black vacuum pipes that run from the inlet manifold to the sensor on the l/h wing,they have a nasty habit of perishing although usually on older 7s
 
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